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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d179b0e298f54c0590fa6938b3e7e3ee3994cdd529dbdf779555b8eacffc778' 
  AND token = 'zhyoeIze74+JsPnWdRslJnSHdYadjT+y8pU+Q5LUykM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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