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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fe7691bb0fa52bc552fbe8500af0f0962ee3ce1c91b911a7ef4c8d52d39576' 
  AND token = 'G5D8OiewFOr2qOPmcC3gRke8m+FDvZAHn4snx0ITF/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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