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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a59baff07f62bd5412adefb90559e702255c373321f9521331aff00d90b503' 
  AND token = 'wJc+vffqUpUr6kb7ow/LyUDtJOaW4hb6pus02Nt6OIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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