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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3d31bb2214244d891648f5e001fc4043bc075c447c48a94b6600f1704b6b60' 
  AND token = 'f2CMexiPMGBzo4s1AFb5jhW5WD/t6++Zar/ZHJEArDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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