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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787ae853956b6567f1156601fe2520cae90be6e5585f3821eb3026cb05a4dc4e' 
  AND token = 'qhOTKYfuOXeV5RLsmxU+p087mbEEdFuzD0CERRZOlCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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