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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7dc7ac344e9e66059b9858236bbe3df0feee72462f48e7d41aa69e1c1a5599' 
  AND token = 'FJZf69qvCb3n6Xtpw6fwh2xLMTQyscDe9LRVxRwdkUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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