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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e492f2b6ea67c50515693047c4aa43a0af52f556125785e1e67f4da354c5f60' 
  AND token = 'gqOyXxXxOhc0qr4JzYT/5CI5/krdg+NmQpuYdwstQwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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