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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f815935556e5800cff16dc206e5eb91566bedb4b6072db651565345a5e972f' 
  AND token = 's1ydj1Ibi8alRO1NfmEfO0ivJ43qbqsoG0JylXTByyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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