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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02abf3f48b9a0766b183fcd8d1bb47bc2bec7182bc87b60630e37bff6362b052' 
  AND token = 'ewCsWGs+9eu4mBbd+H+CTHEKZVeNI7xUEE5YxC745PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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