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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb517b3b760db9c23cd5bf221f3518ba9192e5cfea6a92bc207915d697fd09e' 
  AND token = 'i3XppCYjdbzpi48FEkkiAchwbFoCDOJmElagbK8PaRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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