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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63df79c72d9048c46c20938ca3525b9f4bfb311e26041e4b6cd0de3f4e0c3fbd' 
  AND token = 'VqPJUl6wx7MZdyQoQhs7Syfn9vEhRmyd2scjom9mEkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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