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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175a77c0f093871b3b66f293569417668ba6e17b8f919e72c90e097634dc860e' 
  AND token = 'olFye1JZap0701N43GBzLF4I802gugkrf1p4IDSydf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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