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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e9d7d8227add7e3112ba6b1f8fd156075f0e30ac3b2354f7297795b740dff7' 
  AND token = '0dFOxe7BocxQG31H+qDja3/nMz/GUBOO0RlCvsAWy2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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