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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc4bbbb57e1a72efa30c6345fc6a835f8bdf9e788db72ee652e2c9233df3f05' 
  AND token = '43w9yWDl3dspcjpg5z4ue1euNooEDhnptffO20g5rbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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