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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebc6628c13aa86d74c634cb43b34f2ef0f820ce1009bb55090da8ebf03dd53d' 
  AND token = 'r+R9nnywymwnLCcwyjTPlb5VI82vYSLLDlo1BIRfrLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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