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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa8fd120e287e22d7d305e726ca305c95180a3ecf6cd5c80b75cc4310bce214' 
  AND token = '3gCdyHvixDXWaUl+LagdCK2qNVt6gBP6+ZhN6L0HC14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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