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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95f9a07fd7e73fb6272af16fc9f05ac7c0cb12bf86f14a37efe5690140cdee3' 
  AND token = 'AZyosNaushXLhzYkHeonWNTbERvdNsxdMby+ixLLCeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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