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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdbe3325f44de8ceffc62a40cdc5a14c74ddc95d45e4b90f4708a1cab1bb2c7' 
  AND token = 'aAy0XKf870opQ/j2+cWl7PGfZeXxrFahCyQm+rhoAOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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