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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62685d0130d5accfce4ed9a1464d76a41784db08cbc4f7d3743abfab703f21d' 
  AND token = 'KJjZNmoaRX/uK9LPhpW0aRU4KMB6pse2TrlxBvDkxTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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