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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769fd51fc56341ed907d71b3b04399559ac22c3e3bedd4a69c72336b86b7be6b' 
  AND token = 'McV8lU4AKHemt+ReyDnkEIpe1lSIB1Lw4hf7llrfqcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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