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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dee8a6fe41349d4f533a1f2787a1b10dd726f6dddf4073e21349618a6d51998' 
  AND token = 'SoAlbPJFoO7CVHWOiIIvnUpJQcrwx6Q0nuSWl4flvQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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