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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e7c534ddbdf010e61002c32668551deb7ba8dc1dd50aa28c94c8898f0d37a9' 
  AND token = 'XEBsfPSLWXsNGc1R5+EJnVWJG2b0C2piE85VBKbWA8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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