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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d14551cf038a41f99fe8aeb84f2f2113ad28f95d2e62ee888d085d0f252293' 
  AND token = 'RPBMfoYJMHFujD5PyqNEZ1yaDu+dmR+reOAer8oY7/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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