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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5da12597d36033c8ca7dc769a72e6d965bee30274bb4296c116a452ac9cdf8' 
  AND token = '6MY/GV69wFr/ZA1fTXJsQ59Wabgxf2xWRdn+24Rp02I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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