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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2860b4d9ddb1de86cce94e603d224af0b90928ca2df931e65759e5a8b657285' 
  AND token = 'qf2NB93+ljCpw3WVu87I7SbuoHLoau0egqty/hhE5E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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