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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20eb61b97d3dcfd9de775dee757b4640c458653ba648db838051a524e6e7f53' 
  AND token = 'gA0rk1EViV3zGSf5VuUgFixwJpXGc40gTyfKoXZp8D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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