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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e689592c001a0df5dd4c2ef5f5bd9e8d2d5b61935cb5d19e4db415e873c17395' 
  AND token = 'e2kGQVjzSG2mS8NxlkugOhNkYGcf8+Zjl5qB4pg5xkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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