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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7f525f5c5f267101899ac75fc67d57b0cf743c7e7a256102f9a7776417b77d' 
  AND token = 'SGxgkOu5V35Bx3kcldiS9c8f/aGggy2IFFN2sIhYckM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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