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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdc1994b3e5e5c6864caed5c2db9fade68e6f07f1a719f67f988996029ffabb' 
  AND token = 'r7uCe/30w9gu6pRQa9AIlnfJdFvWYQMCC4rl8xL/HuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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