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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a583467f39ca2dd971ec295bce2f6eab2bfe03a89991f2d02184c1c0a08281d3' 
  AND token = 'b9qIoQQ4lb0Yg2NZV8aPhpSXfquiqr+M+6IfK8kuCQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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