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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e61a950c58f0d91b1582b2e5021207104d6a6b70b9e2d2e4085aae55bedfe7' 
  AND token = 'A7fyEa24+pzC9t4muwShxRfsZ57lqaqWM2O/rpSQXF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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