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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97163d99fad0d3423cd236098296669cc784c3b9bb7cd93bdaea23d3f9ebee73' 
  AND token = 'EavLVNObqXNiBT5B+hXWxsL9C3a5YqWGf893sQjVKIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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