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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d52fef62abbde5dddbaf49d230f6bbb1cd2dd903155f5ec8f6b6486d0db81a' 
  AND token = 'rV0iMRYHQfxTG+4gzUUTefkYpRxjQvLIMLGk62Pi9qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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