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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbad4ef9b74b61ebd8a1a40c896ee655377fe04956e8f28efb62d93ad385c54b' 
  AND token = '5sXTVJvwDl3qq6QDFWylNniIUk8Wu8NsYDCAO903OcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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