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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b97a14b4a71f0ffd61fb0880b3ef45431a12153573e61214ee470a5440edb1' 
  AND token = 'usIJWOSnKUk4iVcp55T1pd8szFOmffdmM2ou3ED/WVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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