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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6391b08b1275f98d35452b7a730b9e05370a52f6c859b125b6b1272b7bbf5b15' 
  AND token = 'c4Lux1njtyHEwImc84gbblfPJBxw6NSFU55SDmDur64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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