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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f366a09dc2ef769b7cc69377893ab2c4927ae269317d56135c4cc3ac3393fe' 
  AND token = 'CIT62HWd9uKpbtK5ZHIdytvkEteseM5HnGX1EJZDHCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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