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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3330f05080f92f577530c40e126db89d903c58bc6b1ebc36c60de56a0c5eb2fb' 
  AND token = 'MC6lgEYp0XA1vOVFNnSyrx39zBcc3IE298yKVrhE/yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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