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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895e3850ba94b1d099481489b297e47c7e92a42864a4704b808d449d97d8d4ef' 
  AND token = 'FjfEHfz0v8lmbgIiYKm62yRwOycUmW6HN06E2Mdbj80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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