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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61ff0b5a1bb4dea1663f6b9253f2f2cb77b076dc3b6774b7383995b54ebfd5e' 
  AND token = 'AuKjYoYUVB7g83H0MHg5jmMXYXPhnM4daEil5K6t8Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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