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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce4e91e56912297c4f426233d68438297ee689478a8bdb4cea2d578838faf87' 
  AND token = 'LYEYlGbtNTbwybaEvBgNYL8pkDXruYWG/N6qx46eo8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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