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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d15092a7f4dbe0097f65b92828b94744900912b011fc6857daea520be0f9a8' 
  AND token = 'QvLSDfk9w5g5dGh/0q48gW99YD2985lAT0IGEMvxJrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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