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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658d5b975e8eee24cd6c55cf950ed18f22a8d4fef9bac9178f300b78e429a0d3' 
  AND token = 'RiFuyU6KnSLZFHf2DTqto5KdbNE8OD+ON7L8XLwQsvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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