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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd68bdae48d978b515bad63b63d4cc0c1e4f8378645b7485a81036fe107e9dd3' 
  AND token = '5Jdfj/MJXyPR7G31BeCmlCNU8A8+qjIHAGXUiTLEqgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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