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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa25010509ff1a82ed1127544cc46f6caba2e4450fb30d128fcc5a57c8b1e9c6' 
  AND token = 'saTeEFH13O+Co8oxsPbVmtyLBIDzP31hClTckvS/goQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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