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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684d5c266c1f96c59568cd2700727aeaf224309d5137694a8a720768480fc459' 
  AND token = 'cls14s9J0rqjiTvrx2vjSLDslN43a8pT+gKe7w94Ukg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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