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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56efc979737f955cf9541e5fb95d911c283cce7b2d1d442b636f2f770d65e03f' 
  AND token = 'wFdYwYS4B3MjtWKZz9NVpAitDUpda/GURWHQxcHeSZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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