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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56547c3337e999ffc93d0310a24080e8e2de1ff832410077441608db9325427' 
  AND token = 'L4HO70p8mOa8rXRyz30S0w4tkKdF83c4ORTkFRUZpj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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