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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e5ff91504af12959b59fccd93976bb4f7d3409ba37f151d6b0150ec1186152' 
  AND token = 'J5hpm+6pmUpYcZbBF1iABR3An84R9biwW4nDUyYCo+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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