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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8d8c85e12f8508b034027d8602e167e1239094bcf99960803da23479ffe117' 
  AND token = 'xHUyYJzn6ia+0W8YQ0XkdS0qTbf6UaBFR2dNtiNSejU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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