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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4eb6eebcebf62c576a6a5bf8ae32e50b5c9a106ca9eabbfd3027e876c1d92ba' 
  AND token = 'KNdGDhweuNS3gefIV4gHKqjVL/apFnhGJLbUO527n2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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