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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a02ca9617a38b730de0fc2d0f4eb24834d3e23abb9290535ced70f4b67379c0' 
  AND token = '2jVrkNZ/Dt+pSCCSzbpUSTTXX1vlJnzuelSXfVn2jrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}