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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d46c74763de7b9cb3b93e26abc60c81a2476aaa1a69d0cfd0363eaa18fa2f13' 
  AND token = '8vPYUbb4FVshcwdzl71icTtOep8GAiANCFSERY+/okA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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