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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b4cd260e9f5ff379a5f497b337d52d9f987de82250d6e1d4db2faf13ebd00d' 
  AND token = 'WVFym6qEMSIUwHH+70TYQtr2i4w34danVAS2+rEFVHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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