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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e454d4204ec73f0958db4ff8dfe0899d4a536f5d5db0d00fbe0606191a58d84' 
  AND token = 'k7K/grCZWjJMxc8PQmJjHsEJwbp2NeVAwoT3klvQt58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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