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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd754be6bbd4c182d64bbdf4701666f686883168992b24e541721521ffa33c08b' 
  AND token = 'IDnKgt7dDOsbXys3SBMExnl1JkCCyo4s1DzgQnzf6bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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