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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8464dee6f04b91f82be9f0840c340c5232f00db42d9a1e472277e2872a236d67' 
  AND token = '1vgT6S+G7cO582x0TdtT4CX2w3XHN1F8PEkOVz0hFp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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